Three roll type shape steel rolling mill

ABSTRACT

A three roll type shape steel rolling mill wherein two bearing boxes each containing an upper inclined non-driving roll are provided inside an inner stand and said inner stand is fitted detachably to the housing of said mill. It is possible to provide a lower horizontal driving roll also within said inner stand. Said inclined and horizontal rolls can be effectively adjusted with respect to period vertical and horizontal direction to provide a desired section of the shape steel.

Unite States Patent [191 Matsufuji et al.

THREE ROLL TYPE SHAPE STEEL ROLLHNG MILL Inventors: Akira Matsuliuji; Kanichi Kishikawa, both of Kitakyushu; Yasuto Sasaki, Nohgata; Susumu Miyaji, Munakatamachi; Fumihiro Tutui, Kitakyushu, all of Japan Nippon Steel Corporation, Tokyo, Japan Filed: Aug. 24, 1972 Appl. No.: 283,526

Assignee:

Foreign Application Priority Data Aug. 24 197] Japan 46-64639 July 29, 1972 Japan 1. 1. 47-76090 US. Cl 72/224; 72/249, 72/238 Int. Cl B2lb 13/10, B2lb 31/08 Field of Search 72/224, 225, 249, 235, 72/238 1 June 4,1974

References Cited UNITED STATES PATENTS 2,191,390 2/1940 Hooper 72/224 X Primary Examiner-Milton S Mehr 5 7 ABSTRACT A three roll type shape steel rolling mill wherein two bearing boxes each containing an upper inclined nondriving roll are provided inside an inner stand and said inner stand is fitted detachably to the housing of said mill. It is possible to provide a lower horizontal driving roll also within said inner stand. Said inclined and horizontal rolls can be effectively adjusted with respect to period vertical and horizontal direction to provide a desired section of the shape steel.

6 Claims, 13 Drawing Figures MTENTEDMII 4 m4 SHEET 03 0? IO PATENTEDJUN M974 3813512 saw un (if w PATENTEDJuu 41914 3,813,812

saw us nr10 PATENTEDJUH 4 I974 sum rm nr 10 PATENTEDJUN 4am 3.813912 sum 1188? w THREE ROLL TYPE SHAPE STEEL ROLLING MILL BACKGROUND OF THE INVENTION In rolling a material wherein a flange or protrusion must be formed in a web such as a shape steel, e.g., tsteel, E-steel, tie plate, and the like, it has heretofore been a practice to use a two-high, three-high or universal rolling mill, etc.

In such a rolling mill using Kaliber rolls, however, it is inevitable to roll a slab after tumbling the same by 90 in some of the kaliber passes so as to form a flange, protrusion and the like. Consequently, it is necessary to add one or more steps in the rolling operation or facilities. Moreover, it is difficult to intimately fill a portion of the slab into the dead hole cut on the kaliber roll wherein said protrusion may be formed, despite of the pushing force exerted by the upper and lower rolls, which results in shortcomings of temper of the protrusion and thus makes it extremely difficult to obtain a product of good quality. Also in the rolling operation, it will give rise to disadvantage that the material tends to wind round the roll or guide when the material passes through the roll due to difference of the degree of elongation of each part of the material.

It is thus conventionally known that the above defects in the prior art can be solved by a three roll mill of all roll driving type, each roll thereof having drive means.

As for this three roll mill, the type is known wherein a horizontal roll is a lower roll above which two inclined rolls are placed in Y-shape so that the axis of each roll may make a side ofa triangle and each roll is driving singularly or through intermediate .linking mechanism from the main driving means.

The above three roll mill in which the rolls have drive means is very useful for the formation of the protrusion of the slab to be rolled. However, it has a disadvantage that since each roll is provided with a driving mechanism the assembly becomes too large and that it must be used exclusively for the particular or limited purpose. In addition, even if there is any change of conditions at the roll bite such as local heat or thickness of the material, it is extremely difficult to adjust the circumferential velocity of each roll so as to make uniform the discharge velocity of each part of the material from the roll.

The present invention overcomes the above mentioned shortcomings and is characterized in that a pair of inclined rolls is made non-driving and at least this pair of rolls is detachably fitted to the housing of the rolling mill in such a manner as a cassette.

It is therefore an object of the invention to provide a three roll type shape steel rolling mill for forming said protrusion from the material or slab wherein a special or large rolling mill for exclusive use is not used and instead a pair of inclined rolls of any desired kind, with or without a horizontal roll, is detachably fitted to a housing of any existing rolling mill such as a universal rolling mill whereby any unit of the assembly can easily be exchanged.

SUMMARY OF THE INVENTION According to the present invention, there is provided a three roll type rolling mill for forming shaped steel, in which the three rolls are arranged such that the respective axes thereof constitute the sides of a triangle,

which comprises a housing, a pair of inclined rolls and a horizontal roll mounted in said housing, said pair of inclined rolls being made non-driving while said horizontal roll is made a driving roll, said pair of inclined rolls being detachably fitted to said housing separately from or together with said horizontal roll, and adjustable means for shifting said roll or rolls whereby the shape steel of a desired section is obtained.

In one aspect of the invention, there is provided a three roll type rolling mill for forming shape steel, in which the three rolls are arranged such that the respective axes thereof constitute the sides of a triangle, which comprises a housing, a pair of inclined rolls and a horizontal roll, said pair of inclined rolls being made non-driving while said horizontal roll is made a driving roll, a pair of bearing boxes or chocks each containing one of the inclined rolls such that it can rotate followably, said pair of bearing boxes being mounted detachably in an inner stand, said inner stand being fitted detachably to said housing and adapted for slidably moving up and down therein.

It is possible to arrange so as to move the lower horizontal roll up and down, for example, at the initial adjustment of the vertical thickness of a slab or material to be rolled. As for the adjustment of the transverse thickness of the protrusion of the material, a screw down shaft for example can be provided to move back and fore the bearing box adjacent to said shaft.

When, it is desired to provide a product in which the thickness of the right and left web thereof is different from each other, an upper wedge and a lower wedge are caused to intervene between the surface of a bear ing box and the frame of the inner stand. The wedges are connected to a suitable operating means such as a handle, a worm-gear, etc. These wedges and means or structures associated therewith are such that the upper and the lower wedges may move in different directions so as to lift up or down said bearing box.

In another aspect of the invention, there is provided a three roll type rolling mill for forming shape steel, in which the three rolls are arranged such that the respec tive axes thereof constitute the sides of a triangle, which comprises a housing, a pair of inclined rolls and a horizontal roll, said pair of inclined rolls being made non-driving while said horizontal roll is made a driving roll, a pair of bearing boxes or chocks each containing one of the inclined rolls such that it can rotate followably, said pair of bearing boxes being fitted to a suspending frame by means of a locking means, said pair of bearing boxes being mounted together with said horizontal roll in an inner stand such that said pair and said roll can respectively move up and down therein, said inner stand being fitted detachably to said housing.

A proceeding and retracting means can be provided to move the bearing boxes toward, or apart from, each other.

In the practice of the present invention, a truck of any suitable design may be used to assemble the inner stand into the housing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is an overall front view ofa preferred embodiment of the invention.

FIG. 2 is a side view of FIG. I.

FIG. 3 is a plan view of a main construction of the invention with a portion thereof broken away.

FIG. 4 is a sectional view of a main construction of the invention with a portion thereof broken away taken along the line A-A of FIG. 3.

FIG. 5 is a sectional view partly omitted and taken along the line 8-8 of FIG. 3.

FIGS. 6 to 8 are schematic views illustrating examples of the section of the product and the combination of the rolls according to the invention.

FIG. 9 is an overall front view of another preferred embodiment of the invention.

FIG. lit) is a side view of FIG. 9.

FIG. II is a front view ofa main construction of the invention with a portion thereof broken away taken along with the line A-A of FIG. 10.

FIG. H2 is a front view of a main construction of the invention with a portion thereof broken away taken along the line BB of FIG. l0.

FIG. I3 is a side view with a portion thereof broken away taken along the line C-C of FIG. ll.

DESCRIPTION OF THE PREFERRED EMBODIMENT One preferred embodiment of the instant invention are shown in FIGS. l to 8. Referring to FIGS. 3 to 5, an inner stand I is mounted above a lower horizontal roll 2. Bearing boxes or chocks 4a and 4b which contain inclined rolls 3a and 312 respectively are fitted to the inner stand such that the bracket la thereof supports said boxes.

Said inclined rolls 3a and 3b are mounted rotatably on a shaft 50 by means of a ball and roller bearing 5. A cap 7 is attached through a keeper plate 6 to each end of the shaft 5a to form a complete set of inclined rolls. The set of inclined rolls is mounted on the seats of the bearing boxes 4a and 4b in such a manner that the shaft 50 rests obliquely to the horizontal plane, on which the cap 7 is covered by a screw 8. An upper wedge 9a intervening between the upper frame of the inner stand I and the upper surface of the bearing box 4a is tapered on its upper surface. A lower wedge 9h intervening between the lower frame ofthe inner stand I and the lower surface of the bearing box 4a is tapered on its lower surface, the gradient of which is identical with that of the wedge 9a. These wedges 9a and 9b can move slidably upon the respective slopes of the upper frame and the lower frame of the inner stand having the same gradients as those of the wedges 9a and 9h.

Screw shafts Illa and 1011 are operated to move the wedges 9a and 9h back and fore by the rotation of a handle l2 via worm-gears Ila and llh. The upper screw shaft Ma and the lower one 10/) are provided with reverse thread with each other. On the inner stand 1 is provided a cover 13 to fix the bearing boxes 4a and 4/2.

A screw down shaft 21 for the inclined rolls is provided to move back and fore the adjacent bearing box 4b in the direction perpendicular to the pass line. which is connected to a operation handle (not shown) through a transmission mechanism (not shown).

A suspending rod 14 for the inner stand is arranged outside the inclined rolls 3:: and 3b in a direction perpendicular to the pass line, one end of which is fixed to the upper side of the inner stand via a connecting member 15 while the other end to a hook to for engagement. On a housing 17 for the rolling mill is provided a frame 18 for receiving a bearing box for an upper roll to be used in case of two-high or universal rolling (in this case a horizontal roll). A hook l9 fixed to a balance beam 28 (FIG. 2) for the upper roll and the hook 16 are engaged with each other through a rod 20 of a balance cylinder 27 (FIGS. 1 and 2) for the upper roll. The inner stand I is tightly pushed up to the frame 18 for the bearing box for the upper roll (in this case a horizontal roll) via the cover I3.

The horizontal roll 2 is journaled below the housing 17 opposite to the inclined rolls 3a and 3b and is c0nnected to a driving means (not shown) through a coupling, driving shaft or other transmission mechanism (not shown).

The pair of inclined rolls 3a and 3h may be assembled outside the housing 17, for example, at the roll shop. That is, the bearing boxes 40 and 4b containing the respective inclined rolls 3a and 3b are fitted to the inner stand I as explained above. The cover 13 is then attached to the upper frame of said inner stand 1 so as to cover said bearing boxes, whereby these bearing boxes are fixed and prevented from its movement in the direction of the pass line and the direction perpendicular thereto. Thereafter the hook 16 fixed to one end of the rod 14 is attached to the inner stand 1 via the member 15.

The inner stand ll thus assembled is rested on the bearing box 29 for the horizontal roll 2 placed on a truck for assembling rolls, which is then brought into the housing 17 together with the roll 2. The hook 16 provided on the inner stand I is then caused to engage with the book 19 fixed to the rod 20 of the upper roll balance cylinder. The inner stand 1 is then hooked up by the operation of said balance cylinder so that the inner stand I is tightly pushed up to the frame 18 for the upper roll bearing box through the cover 13. As the result of these assembling, the bearing boxes 4a and 4b are rigidly fixed by the pushing force of the cover 13 and the lower frame of the inner stand 1. The inner stand I is fixed by prevention of its movement by said housing 17 in the direction of the pass line and a known clamp means 22 in the direction perpendicular to the pass line.

As for the horizontal roll 2, it is fixed, like a two-high mill, by prevention of its movement by the housing and the known clamp means in the direction of the pass line and in the direction perpendicular to the pass line, respectively.

The initial setting or adjustment of the rolls of the present invention wherein the inclined rolls 3a and 3b are non-driving is as follows.

The thickness in the vertical direction of the slab or material to be rolled may be determined by upward or downward movement of the horizontal roll 2, and the thickness thereof in the transverse direction or the thickness of the protrusion of the material may be determined by the transverse movement of the screw down shaft 21 by the operation of a handle (not shown).

In a particular case when it is desired to give different thickness to the right and left web as in the T-shape steel, it can be done by the up and down movement of the bearing box 4a. As shown in FIG. 4, when the screw shafts 10a and 10h are allowed to move back or fore through worm gears Ma and 11b by the operation of the handle 12, the wedges 9a and 9b connected to the shafts MM and 10b respectively are caused to move slidably toward, or apart from, the opposite bearing box 41). That is, since the screws 10a and 10b are provided with the reverse thread with each other. the bearing box is allowed to move up and down responding to the rotation of the screws 111a and lfib. Accordingly. when it is desired to adjust the thickness of the right and left webs of the material, the standard thickness thereof can be set between the inclined roll 3b and the horizontal roll 2 which can move up and down and the correction of the thickness thereof can be made between the inclined roll 3a and the horizontal roll 2.

When the rolling is effected according to the present invention, the rolling load of the inclined roll may be absorbed, through the inclined roll 3b. the ball and roller bearing 5 and the shaft 5a, by the bearing box 4b to which the cap 7 is screwed and even by the inner stand 1 and the screw down shaft 21.

The above mentioned embodiment has been described chiefly with respect to the rolling of T-shape steel as shown in FIGS. 1 to 5, but the present invention is not limited thereto. It is therefore possible to effect rolling of angle steel (FIG. 7) or Y-shape steel (FIG. 8). etc. in addition to T-shape steel (FIG. 6) by combination of such as an inclined rolls 23a and 23b or 25a and 25h with a horizontal roll 24 or 26. It is also thought that, without departing from the spirit of the invention, a pair of non-driving inclined rolls having suitable configuration and a driving horizontal roll of suitable configuration may be combined to effect rolling of a shape steel having any other desired configuration.

Another preferred embodiment of the present invention is shown in FIGS. 9 to 13. An inner stand 102 is detachably fixed to a housing 101 for the rolling mill. A pair of bearing boxes or Chocks 110a and 110/? containing the respective non-driving inclined rolls 103a and 103 capable of rotating followably and a lower horizontal driving roll 104 are mounted in said inner stand such that they can move upward and downward.

The inclined rolls 103a and 10312 are mounted rotatably on the shafts 1116 via the bearings 105. The shaft 106 is covered on its lower end with a cap 109 through keeper plates 107 and 108 and on its upper end with another cap 109, keeping a keeper plate 107 in tight contact with the frange of the shaft 106. which constitutes a set of inclined roll.

The inclined roll sets are fitted detachably to the respective recessed portion provided in the bearing boxes 1111a and 1111!) such that the inclined axes thereof together with the axis of the horizontal roll will make a triangle. The side of said cap 109 and the flange of the shaft 106 opposite to the material to be rolled is kept locked by a stripper guide 111 so that the inclined roll sets may be assembled into the bearing boxes 110a and 110/). A suspending frame 112 is adapted to keep together the pair of bearing boxes 110a and 11012, the upderside of which frame is provided a shallow recessed portion adapted for receiving the top heads of the bearing boxes 110a and 1101). A plurality of clamping or locking means 113 in which a fluid pressure cylinder such as an oil pressure cylinder 113a is used is arranged parallel to the axis ofthe horizontal roll and toward the pass line center of the frame 112.

A suspending rod 113 is provided before and behind the oil pressure cylinder 113a in the direction of the pass line. One end of the rod 113/7 reaches a groove 115 through a hole provided in the frame 112. Said groove 115 is provided on the upper part of the bearing boxes 110a and 1111b in the direction of the axis of the horizontal roll. To the end of the rod 11% is fixed a pulley 116 within said groove 115.

The pulley 116 has a base part 116a to which the rod 113]) is attached. and before and back the base part are rotatably fixed the shafts 1160 having rollers 116k on both ends.

A linking rod 113c has a fork end part on each side. Its center part is fixed by any suitable locking means to the end of a piston rod 113d contained in the cylinder 113a. Its one end is connected by pin to the upper end of one suspending rod 113!) and the other end to the upper end of another suspending rod 113b.

A push down auxiliary frame 117 for the inclined rolls 103a and 1113b are rested on a shelf 118 projecting from the inner wall of the inner stand 102.

Said frame is fitted to the inner stand 102 slidably be tween said shelf 118 and a keeper plate 119. One side of said frame butts a screw down shaft 127 and the other side thereof is connected tightly by means of a hook rod 120 to the bearing boxes a and 110/2.

The hook rod has a hammer like head engaged with a groove 121 which is provided in the lower and outer part of the bearing boxes 110a and 1101). The other end thereof extending from the frame 117 is provided with a fork end 122, which is then connected through a piston rod 123 to a tension means 124 such as an oil pressure cylinder.

A turn buckle 125 is provided having the locking ends 126a and 126b respectively on the bearing boxes 110a and 1101) and on the push down auxiliary frame 117. This turn buckle is intended to keep these bearing boxes and the frame toward each other or apart from each other.

The screw down shaft 127 has a male thread portion to match with a female thread portion 129 of a proceeding and retracting means 128. The tip end of the shaft 127 butts a receiver 131 provided on the frame 117 which in turn intimately contacts with the boxes 110a and 11012 through a pressure plate 130. The other end of the shaft 127 is connected to a screw down means 133 for vertical rolls (FIG. 10) mounted on the upper part of the housing 101 through such transmission gears as bevel gears (not shown) and a vertical transmission shaft 132 (FIG. 9). Two shafts 127 are provided on each outside of the auxiliary frame 117.

A hook 134 is provided on the frame 112 near the housing 101 and is pinned to a pick-up portion 112a of the frame 112.

An oil pressure cylinder 135 is embedded in the upper part of the housing as shown in FIG. 13. To the end of its piston rod 136 is attached a hook 137, which is in turn engaged with the hook 134 of the frame 112.

In FIG. 13 is shown a supporting rod 138 having a contact end of any desired configuration, which is screwed to the pick-up portion of the frame 112 so that said contact end is brought into contact with the upper surface of the inner stand.

A projection 139 for receiving thrust is provided on the frame 112, which is inserted into a recessed portion 140 of the inner stand 102.

A screw down means 141 for the upper horizontal roll is provided on the upper center part of the housing and a screw shaft 142 butts a receiver 144 through a pressure plate 143, which makes it possible to move the frame 112 upwards or downwards by the combined operation with the cylinder 135.

A stopper member 1121) is provided on each side of the frame 112 so as to come into contact with the outer sides of the bearing boxes 110a and 1110b. It can be locked to said bearing box 110a or 11012 by, for example, a bolt 145.

The horizontal roll 104 placed below a pair of inclined rolls is journaled by its neck on a chuck 146 and is mounted rotatably on the inner stand 102 by means of said chuck 146.

Any driving means (not shown) is connected via a spindle (not shown) to a coupling 147 engaged with the lower horizontal roll 104.

A screw up means 148 for the lower horizontal roll is intended to move the horizontal roll 104 upwards or downwards.

The operation of the above mentioned mill is as follows:

The push down auxiliary frame 117 is connected to the bearing boxes 110a and 110/) each having the respective inclined rolls 103a and 103k rotatably mounted therein. The frame 117 can be fixed such that the head of the hook rod 120 ofthe frame 117 is caused to engage with the groove provided on the lower and outer side of the bearing boxes 110a and 110!) while the bearing boxes and the frame 117 are connected to gether by means of the turn buckle 125.

Then the bearing boxes 110a and 11012 are arranged so that the inclined rolls 103a and 103k stand face to face. and the suspending frame 112 are mounted on these bearing boxes.

Thereafter the pulley 116 is inserted into the groove 115 of the bearing boxes 110a and 110/) from the side end thereof and placed just below the hole for the rod 11312 provided in the frame 112. The rod 113 is inserted through said hole from the upper side of the frame and the lower end of the rod 113/) is attached with the pulley 116.

Then the upper end of the rod 113]) is pinned to the fork end portion of the rod 113(- whereby the bearing boxes 110a and 1101) are clamped to the frame 112.

The pulley 116 is shown as provided on each suspending rod. but it is of course possible to combine two pulleys into one which are inserted into one groove 115 provided on the bearing boxes 110a and 1101) by matching with the distance between the suspending rods.

into the inner stand 102 is assembled the horizontal roll 104 which has been journaled by its neck on the bearing box or chock 146.

Thereafter the stopper 112i) and the bearing boxes 1 a and 11.01) are clamped by the bolt 145 to thereby prevent displacement of the bearing boxes at the roll changing. The bearing boxes 110a and 110!) to which the frame 112 has been attached is then lifted by a crane and mounted in the inner stand 102 and allowed to rest upon the shelf 118 projected from the inner wall of the inner stand 102.

The frame 112 is arranged such that the suspending rod 138 screwed to the pick-up portion 112a of the frame 112 butt the inner stand 102 and thereby the weight of the frame 112 is imparted on the inner stand 102. Accordingly, the bearing boxes 110a and 11012 and the frame 117 are restd on the shelf 118 and the frame 112 are rested directly on the inner stand 102, respectively.

Then the keeper plate 119 is fixed to the upper side of the inner stand by means of a locking means such as a bolt, which plate serves as a guide for the auxiliary frame 117.

The hook rod 120 which has pierced through the frame 117 is caused to engage with the end of the piston rod 123 contained in the oil pressure cylinder 124 via the fork end 122 provided on the outer end of said frame 117.

Said cylinder 124 may be placed inside the inner stand 102 by any desired fixing means such as a bracket (not shown).

The inner stand 102 thus sassembled is mounted into the housing 101 by means of a truck and clamped to the housing 101 by any clamping means 114.

After the inner stand 102 is fitted to the housing 101, the bolt 145 is screwed back to release the clamp between the stopper portion 1121) of the frame 112 and the bearing boxes 110a and 1110b.

The turn buckle 125 is also loosened to release engagement either by the end 126a or by the end 126b.

Each oil pressure cylinder 113a. 124 or is connected to an oil pressure generating means provided outside the rolling mill by means of an oil pipe (not shown) such as a flexible tube.

Then the hook 134 of the frame 112 and the hook 137 are caused to engage with each other, and the cylinder 135 is actuated by introducing the pressure oil thereto so as to lift up the frame 112. Then by means of the operation of the cylinder 1130, the suspending rod 113i) is lifted, the bearing boxes 110a, 1101) are kept off from the shelf 118 while the rod 138 is lifted as high as possible to release out of contact with the inner stand 102.

After the bearing boxes 110a, 1101) are kept in condition for free adjustment the screw shaft 142 is allowed to go down to push the frame 112 by means of the plate 143 and the receiver 144 to effect desired screw down adjustment of the bearing boxes.

The bearing boxes 110a and 110i; and the frame 117 are connected by means of the hook rod 120, which is.

an turn connected to the piston rod 123 of the cylinder 124 via the fork end 122 provided on the other end of the hook rod 120. Consequently, when the pressure oil is introduced into the cylinder 124, the bearing boxes 110a and 11017 are pulled outward, respectively.

The screw down shaft 127 moves toward or apart from the center of the mill whereby the bearing boxes 110a and 1101) move toward or apart from the center of the mill so that the desired screw down adjustment may be effected.

At this time the bearing boxes 110a and 11% are contacted to the frame 112 with the roller 1161) provided on the pulley 116 in the upper interior surface of the groove 115. Thus they can slidably move while rotating said roller 1161), which thus makes it possible to decrease the friction power at the sliding motion of the boxes 110a and 1101) caused by the clamping of the boxes 110a and 110i) and the suspending frame 112.

The lower horizontal roll 104 can be pushed up to the pass line sliding inside the inner stand 102 by means of the screw shaft 148a of the screw up means 148.

The lower horizontal roll 104 is clamped to the inner stand 102 via the chuck 146 by a clamping means (not shown) in the direction perpendicular to the pass line.

The initial adjustment or setting of the rolls in this case is effected as follows.

The setting of the pass line and the vertical thickness of the material to be rolled can be determined by adjusting the gap between the inclined rolls and the lower horizontal roll by up and down motion of the lower horizontal roll. The transverse thickness or the thickness of the protrusion of the material can be set by adjusting the gap between the right and left inclined rolls by the use of the shaft 127, the cylinder 124 and the vertical roll screw down device.

The adjustment of the vertical or transverse thickness during rolling can also be effected by the use of the above mentioned means.

The above mentioned embodiment has been described chiefly with respect to the rolling of Y-shape steel as shown in H65. 9 to 13, but the present invention is not limited thereto. lt is of course possible to effect rolling of T-shape steel (FIG. 6) or angle steel (FIG. 7) by combination of the inclined rolls with the horizontal roll having suitable configuration.

It is thought, as is the case of the first-mentioned embodiment, that a pair of non-driving inclined rolls having suitable configuration and a driving horizontal roll of suitable configuration may be combined to effect rolling of a shape steel having any other desired configuration without departing from the spirit of the invention.

As set forth hereinbefore, the present invention has a very simple structure capable of exchanging the inclined rolls according to the configuration of the shape steel to be produced, which overcomes the various disadvantages encountered in the prior art such as bulky or complicated facilities required by the three roll type rolling mill of all driving system or defects in the operation of two-high or other rolling mill using kaliber roll system. As a result, the rolling of T-steel, Y-steel, angle steel, E-steel and the like can be effected very easily. Moreover, the mill for exclusive use is made unnecessary and the existing universal or two-high mill, etc. can be utilized as it is, which makes it possible to utilize one rolling mill for various objects. The product can be produced by the present invention at lower cost with cheaper facilities and is of higher quality as compared with that of the prior art.

We claim:

1. Apparatus for adapting a universal rolling mill such as a two-high rolling mill or a four roll mill and the like for service as a three roll type rolling mill for forming shaped steel, in which the three rolls are arranged such that the respective axes thereof constitute the sides of a triangle, which comprises:

a housing,

a pair of inclined rolls and a horizontal roll mounted in said housing, said pair of inclined rolls being non-driven, said horizontal roll being a driven roll, at least said pair of inclined rolls being supported in an inner stand structure, said inner stand structure being detachably fitted to said housing, and means for adjustably shifting said rolls relative to each other to shape the steel to a desired section.

2. Apparatus according to claim 1 which comprises a pair of bearing boxes which are carried in said inner stand, said bearing boxes each rotatably receiving one of the inclined rolls, said bearing boxes being mounted detachably in said inner stand, said inner stand being adapted for slidably moving in said housing.

3. Apparatus according to claim 1 in which said pair of bearing boxes are fitted to a suspending frame by means of a locking means, said horizontal roll being mounted in said inner stand, the mounting of said horizontal roll and said inclined rolls being such that said pair and said horizontal roll can respectively move up and down in said inner stand.

4. Apparatus according to claim 3 wherein a screw down shaft is provided to move said bearing boxes back and forth in a direction perpendicular to the pass line in which the shaped steel is moved.

5. Apparatus according to claim 4 wherein the inner stand includes a frame and an upper and a lower wedge are provided between one of the bearing boxes and the frame, said upper and lower edges being connected to an operating means such that they can move in a direction opposite to each other to thereby move said one bearing box up and down.

6. Apparatus according to claim 3 wherein advancing and retracting means are provided to move the bearing boxes selectively toward, and apart from, each other. l l 

1. Apparatus for adapting a universal rolling mill such as a two-high rolling mill or a four roll mill and the like for service as a three roll type rolling mill for forming shaped steel, in which the three rolls are arranged such that the respective axes thereof constitute the sides of a triangle, which comprises: a housing, a pair of inclined rolls and a horizontal roll mounted in said housing, said pair of inclined rolls being non-driven, said horizontal roll being a driven roll, at least said pair of inclined rolls being supported in an inner stand structure, said inner stand structure being detachably fitted to said housing, and means for adjustably shifting said rolls relative to each other to shape the steel to a desired section.
 2. Apparatus according to claim 1 which comprises a pair of bearing boxes which are carried in said inner stand, said bearing boxes each rotatably receiving one of the inclined rolls, said bearing boxes being mounted detachably in said inner stand, said inner stand being adapted for slidably moving in said housing.
 3. Apparatus according to claim 1 in which said pair of bearing boxes are fitted to a suspending fRame by means of a locking means, said horizontal roll being mounted in said inner stand, the mounting of said horizontal roll and said inclined rolls being such that said pair and said horizontal roll can respectively move up and down in said inner stand.
 4. Apparatus according to claim 3 wherein a screw down shaft is provided to move said bearing boxes back and forth in a direction perpendicular to the pass line in which the shaped steel is moved.
 5. Apparatus according to claim 4 wherein the inner stand includes a frame and an upper and a lower wedge are provided between one of the bearing boxes and the frame, said upper and lower edges being connected to an operating means such that they can move in a direction opposite to each other to thereby move said one bearing box up and down.
 6. Apparatus according to claim 3 wherein advancing and retracting means are provided to move the bearing boxes selectively toward, and apart from, each other. 